<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <h2 v-if="score>=90">优秀</h2>
      <h2 v-else-if="score>=80">良好</h2>
      <h2 v-else-if="score>=60">及格</h2>
      <h2 v-else>不及格</h2>

      <h1>{{result}}</h1>
    </div>

    <script src="../js/vue.js"></script>

    <script>
      const app = new Vue({
        el: "#app",
        data: {
          score: 55,
        },
        // 但判断较多的时候,建议使用的逻辑
        computed: {
          result() {
            let showMessage = "";
            if (this.score >= 90) {
              showMessage = "优秀";
            } else if (this.score >= 80) {
              showMessage = "良好";
            } else if (this.score >= 60) {
              showMessage = "及格";
            } else {
              showMessage = "不及格";
            }
            //...
            return showMessage;
          },
        },
      });
    </script>
  </body>
</html>
